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 <h1>预定义常量</h1>

 <p class="simpara">下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。</p>
 <p class="para">
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    <dt id="constant.exif-use-mbstring">
     <strong><code>EXIF_USE_MBSTRING</code></strong> 
     (<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
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  The <span class="function"><a href="function.exif-imagetype.html" class="function">exif_imagetype()</a></span> lists several related built-in
  constants.
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